How far should the flue liner tile project above the masonry cap?

The correct answer indicates that the flue liner tile should project a minimum of 4 inches above the masonry cap. This requirement is crucial for ensuring proper ventilation and function of the chimney system.

When a flue liner tile projects adequately above the masonry cap, it helps prevent downdrafts, which can lead to smoke or harmful gases returning into the living space. Additionally, this height allows for better dispersion of gases and reduces the risk of condensation within the chimney, which could lead to deterioration of the flue or create other structural issues.

This standard helps maintain the efficiency and safety of the chimney system, minimizing potential hazards associated with poor exhaust ventilation. Therefore, the requirement for a minimum of 4 inches serves to ensure that the flue liner functions as intended while also complying with safety regulations. Proper installation and adherence to these guidelines are critical for the longevity and operational efficacy of the chimney system.